Air handling unit



FIG. 1 is a top plan view of an air handling unit, showing my new design.

FIG. 2 is a front elevational view thereof.

FIG. 3 is an end elevational view thereof.

FIG. 4 is a rear elevational view thereof.

FIG. 5 is an elevational view of the end opposite that shown in FIG. 3.

FIG. 6 is a bottom plan thereof.

The dotted lines in FIGS. 2, 3, 4 and 5 represent a mounting curb for a flat roof top and are shown for environmental purposes only and form no part of the claimed design. 

The ornamental design for a air handling unit, as shown and described. 